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How to restrict Rounding using Printf?

 
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# 1  
Old 12-09-2013
How to restrict Rounding using Printf?
Hello,
I am using bash shell on Linux OS, May i please know why is it rounding for big numbers but not for others, is there a workaround to print it as it is with out round off?

Code:
printf '%'\''.2f\n' 9999999999999999999.99
10,000,000,000,000,000,000.00

Code:
printf '%'\''.2f\n' 99999999999999.99
99,999,999,999,999.99

Thank you.
# 2  
Old 12-09-2013
Floating point numbers do not have infinite precision. They are a fixed number of bits multiplied by two to a mantissa. If you keep adding zeroes, sooner or later it will run out of space in the base number and have to truncate(not round) and increase the mantissa instead.

If you require calculation with infinite precision, the bc utility does exactly this.
 
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